Kev txhim kho qhov chaw nruab nrab C yog qhov chaw nruab nrab lossis qhov chaw tshuab tshwj tsis txaus, muaj npe los ntawm qhov "C" rau qhov chaw nruab nrab uas muaj duj li, tsim los mus kub cia, pab, thiab nruab nrab ib tug kab roj sib thooj. Qhov kev pabcuam tseem ceeb tshaj plaws yog kom kab roj sib thooj nyob deb ntsiag, tso tsis pub kab roj sib thooj yuav hla lossis yuav tsha, khaws kev sib txawv, thiab tso tsis pub kab roj sib thooj los ntawm cov khoom siv los yog kev puas tsuaj, vim li no tuaj yeem siv tau ntau zaus dua. Thaum twg kuj tsim los ntawm cov khoom siv nyab, zoo li UHMW-PE (Ultra-High-Molecular-Weight Polyethylene), nylon, lossis lub steel zoo tshaj plaws, qhov chaw nruab nrab C yuav kub cia kab roj sib thooj, kom lub roller tuaj yeem ncav cuag ntev nrog qhov chaw kub cia. Nyob rau hauv tshuab tshwj tsis txaus, xws li cov chaw nruab nrab caterpillar siv rau hauv plastic extrusion lines, cov chaw nruab nrab no yog tseem ceeb heev. Cov chaw nruab nrab no pab kom kab roj sib thooj uas tso cai rau cov caterpillar treads nyob deb ntsiag, kom cov treads tuaj yeem tso ib tug kev tso cai zoo thiab zoo tshaj plaws rau hauv daim phiaj uas tsim tshiab. Qhov kev tso cai zoo no yog tseem ceeb los kom daim phiaj plastic nyob zoo thaum nws sov; qhov twg muaj kev tsis nyob deb ntsiag lossis kev tsis zoo ntawm kab roj sib thooj yuav tshwm sim kev sib txawv ntawm kev tso cai, ua rau daim phiaj puas tsuaj, muaj cov ntaub ntawv puas tsuaj, lossis muaj qhov thickness tsis zoo. Vim li no, qhov kev tsim kho tseem ceeb ntawm qhov chaw nruab nrab C yog tseem ceeb rau kev ncav cuag zoo, kev nyob zoo, thiab qhov zoo ntawm cov khoom siv rau hauv kev tsim khoom ntev.